Fugitive Emissions Standards & Laboratory Test …...Common Valve Test Standards • API 624,...

Fugitive Emissions Standards & Laboratory Test Methods

for Valves

By: Greg JohnsonPresident, United Valve

50 Years in 50 Seconds

1964 Houston air pollution Measuring air pollution in 1974

50 Years in 50 Seconds

“The air is greener in Pasadena”

50 Years in 50 Seconds

Not anymore!

Thanks to the the end-users, valve manufacturers,

valve service companies, leak abatement firms,

packing manufacturers and everyone who had a

hand in cleaning our air!

The past 20 years

• End-users pushed the

valve manufacturers

through the API

• Initial tests were based

upon Method 21

• First US industry valve test

standard was

ANSI/ISA SP93.00.01 in

1999

Testing standards

• MSS created a

packing test

standard in 1997

• First API test

standard – API 622,

packing test, 2006

• API 624, 2014

• API 641, 2016

• ISO 15848-1, 2006

First United Valve FE test- 2001

What Makes a Valve Low-

emissions capable?

• FE containment Packing

• Little or no stem run-out

• Correct stem & stuffing box

finishes

• Correct dimensions &

tolerances of all packing

chamber components

• Proper torque on packing

Dimensions & tolerances are critical for FE

containment

Stem

1) Diameter

2) Straightness

3) Runout

4) Finish

5) Cylindricity

Packing gland

1) ID

2) OD

Packing

1) ID

2) OD

3) For API, Must be

RP622

Bonnet

1) ID

2) OD

3) Finish

Why We Test

• Repeatability is still a major

issue in low-cost manufacturing

countries

• Legacy designs do not address

the dimensions and tolerances

needed for Low-E packing

efficacy

• Some manufacturers still don’t

know how to achieve

repeatable Low-E compliance

Common Valve Test Standards

• API 624, “Type Testing of Rising Stem Valves

Equipped With Graphite Packing for Fugitive

Emissions”

• API 641, “Type Testing of Quarter-turn Valves

for Fugitive Emissions”

• ISO 15848-1, “Industrial Valves- Measurement,

test, qualification procedures for fugitive

emissions” (type testing)

• End-user “type testing”

API 624 – for Multi-turn valves

• Next edition (2nd) due out in 2018

• 3 thermal cycles @ 500o F

• 310 Mechanical cycles

• Both static and dynamic leakage

measurements

• Gasket leakage above 50 ppm

cause for rejection

• Maximum test pressure 600 psig

• Required by API 600, API 602, API

603, API 623 & RP591

API 624 – for Multi-turn valves

Testing a 20” class 900 gate valve

Typical API 624 set-ups

Test software GUI interface

API 641 – for Quarter-turn valves

• First edition 2016

• 3 thermal cycles

• 610 Mechanical cycles

• Both static and dynamic

measurements

• Multiple categories or “groups”

• Maximum test pressure 600 psig

• Not yet required by API ¼ turn design

standards API 599, API 608, API 609

API 641 – for Quarter-turn valves

Testing ball valves to API 641

ISO 15848-1

• “Cafeteria” style multiple classifications

– Tightness classes

– Endurance classes

– Temperature classes

• Primarily a helium procedure, but

methane is allowed

• Very popular for valves to be used in

the EU and China

• Used for valves that don’t fall under API

standards & testing criteria

• Used for control valves because of high

number of cycles

• ISO 15848-2 is a production test for

valves originally qualified to 15848-1

Cryogenic FE testing

Failure Modes

• Catastrophic bushing failure

– Galling & lock-up

– Total removal of threads because of poorly

machined components

• Stem scoring due to poorly machined or

out-of-tolerance parts

• Gross gasket leakage

• Lubricant dripping down from bushing

• Gross packing leakage due to poor

dimensions or tolerances

Bushing Failure

Original bushing After threads gouged out

Dripping lubricant

Not an issue when valves were tested in the stem

horizontal position

Dimensions & tolerances are

extremely important

Large linear valve issues

• Stem & flow horizontal – not good

• Potential for substantial FE leakage

• Side-loading of packing

• API 624 requires a stem vertical test

API 624 – large valves

Component misalignment causes leaks

Yoke

Stuffing box

Backseat bushing

Disc to stem alignment

Body & disc guides

Yoke bushing or actuator mount

Stem Horizontal Issue

Gravity

This side of packing can be over-

compressed

API 624 – large valves

in horizontal service

Yoke bushing or actuator mount

Yoke

Stuffing box

Backseat bushingBody & disc guides

Stem to disc

“T-head” alignment

Cumulative errors in dimensions & tolerances are

can cause catastrophic packing failures

Horizontal issues (cont.)

What about low emissions valves in

horizontal orientations? Some

Suggestions:

-Total misalignment of stem should be

less than 0.020” for most low E packings

to work.

-Double check all dimensions and

relational parts geometry

-Assemble or actuate the valve in the

stem vertical position

-Confirm damage free movement of stem

(cycle open and close)

-Optional: Perform an EPA method 21

type test- a low pressure gas test looking

for bubbles at the packing area

A word about testing facilities

• All testing facilities are not created

equal

• It is not just equipment and

technicians

• Engineering experience and real-

world valve expertise are very

important

• End-user concern if “low-cost-

country” testing is allowed

IMHO & Looking into

the crystal ball

• Helium will replace methane

as the test gas

• API will create a full-featured

type test standard that will

include high temperature FE

testing at working pressures

• API will create a helium

production test standard

Questions?

The ultimate in leaky valve containment!